HTTP POST Request passing ApiKey in Power Query

[CalebGuthrie]

I'm trying to build a report from a third party API as a datasource and it requires POST requests. The documention provided is limited and I'm running out of how tos/article from Google searching! I could use some help here if anyone has figured out a solution.

Here's where I'm at thus far.. I've tried what feels like every variation in the syntax..

This is what I'm getting in return.. It's been anywhere from this to cannot convet text to binary.

When I run it in Postman it works perfect.. just not in Power Query.

Sample data that was provided...